package com.haiyou.crawler.util;


import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class HttpClientUtils {

    public static final String ENCODING = "UTF-8";
    // 设置连接超时时间，单位毫秒。
    private static final int CONNECT_TIMEOUT = 10000;
    // 请求获取数据的超时时间(即响应时间)，单位毫秒。
    private static final int SOCKET_TIMEOUT = 10000;
    private static RequestConfig requestConfig = null;

    static {
        RequestConfig.Builder builder = RequestConfig.custom();
        builder.setConnectTimeout(CONNECT_TIMEOUT); //设置连接超时时间，单位毫秒
        builder.setSocketTimeout(SOCKET_TIMEOUT); //请求获取数据的超时时间(即响应时间)，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
        builder.setConnectionRequestTimeout(CONNECT_TIMEOUT);
        requestConfig = builder.build();
    }

    /**
     * GET 请求handle方法
     *
     * @param url     请求地址
     * @param headers 请求头集合
     * @param params  请求参数集合
     * @return
     * @throws Exception
     */
    public static HttpGet doGetHandle(String url, Map<String, String> headers, Map<String, String> params) throws Exception {
        // 创建httpClient对象
//        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 创建访问的地址
        URIBuilder uriBuilder = new URIBuilder(url);
        if (params != null) {
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                uriBuilder.setParameter(entry.getKey(), entry.getValue());
            }
        }
        // 创建http对象
//        System.out.println(uriBuilder.build().toString());
        HttpGet httpGet = new HttpGet(uriBuilder.build());
        httpGet.setConfig(requestConfig);
        // 设置请求头
        packageHeader(headers, httpGet);
        return httpGet;
    }


    /**
     * POST handle方法
     *
     * @param url     请求地址
     * @param headers 请求头集合
     * @param params  请求参数集合
     * @throws Exception
     */
    public static HttpPost doPosthandle(String url, Map<String, String> headers, Map<String, String> params) throws Exception {
        // 创建http对象
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);
        // 设置请求头
        packageHeader(headers, httpPost);
        // 封装请求参数
        packageParam(params, httpPost);
        // 执行请求并获得响应结果
        return httpPost;
    }


    /**
     * Description: 封装请求参数
     *
     * @param params
     * @param httpMethod
     * @throws UnsupportedEncodingException
     */
    public static void packageParam(Map<String, String> params, HttpEntityEnclosingRequestBase httpMethod)
            throws UnsupportedEncodingException {
        // 封装请求参数
        if (params != null) {
            List<NameValuePair> nvps = new ArrayList<>();
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }

            // 设置到请求的http对象中
            httpMethod.setEntity(new UrlEncodedFormEntity(nvps, ENCODING));
        }
    }

    /**
     * Description: 封装请求头
     *
     * @param params
     * @param httpMethod
     */
    public static void packageHeader(Map<String, String> params, HttpRequestBase httpMethod) {
        // 封装请求头
        if (params != null) {
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                // 设置到请求头到HttpRequestBase对象中
                httpMethod.setHeader(entry.getKey(), entry.getValue());
            }
        }
    }

    /**
     * 发送请求，处理请求数据
     */
    public static HttpClientResult getHttpClientResult(CloseableHttpClient httpClient, HttpRequestBase httpMethod, HttpClientContext httpClientContext) {

        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpMethod, httpClientContext);
            if (response == null || response.getStatusLine() == null) {
                return new HttpClientResult(HttpStatus.SC_INTERNAL_SERVER_ERROR);
            }
            String content = EntityUtils.toString(response.getEntity(), ENCODING);
            return new HttpClientResult(response.getStatusLine().getStatusCode(), content);

        } catch (Exception e) {
            e.printStackTrace();
            return new HttpClientResult(HttpStatus.SC_INTERNAL_SERVER_ERROR);
        } finally {
            try {
                release(response, httpClient);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * Description: 释放资源
     *
     * @param httpResponse
     * @param httpClient
     * @throws IOException
     */
    public static void release(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) throws IOException {
        // 释放资源
        if (httpResponse != null) {
            httpResponse.close();
        }
        if (httpClient != null) {
            httpClient.close();
        }
    }


}

